キラルなβ-ジケトナトを配位子とするユウロピウム（III）錯体の励起子円二色性の研究

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  • Study on Exciton Circlar Dichroism in Europium（III）Complexes with Chiral β-diketonato ligands

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In this study, the exciton circular dichroism（exciton CD） of the tris（chiral β-diketonato） europium（ III） complex［ EuI（II（+）-hfbc）3］which would exhibit large chirality in sulfoxide（dmso） solution were reported and its dissolved configuration were considered in comparison with the previous related studies of chiroptical spectra in chiral EuIII complexes. 　The exciton CD, fluorescence and excitation spectrum were changed as the concentration of dmso solution of［ EuI（II（+）-hfbc）3］increased. Especially, the exciton CD showed remarkable bands with large Δε（molar absorptivity） in ultraviolet region. These results indicate another EuIII complex［ EuI（II（+）-hfbc）（3 dmso）n］are generated with increasing dmso solution and it retains chiral configuration. 　The ultimate goal of a series of this study is to develop measurement of Magnetochiral dichroism（MchD） in chiral lanthanide（ III（）LnIII） complexes. These chiroptical spectra data of［ EuI（II（+）-hfbc）3］would serve a basic data in MchD measurement and lead to investigate a relation between MchD and chiral configurations in chiral LnIII complexes.

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